70643540 has 48 divisors (see below), whose sum is σ = 163404864. Its totient is φ = 25440000.

The previous prime is 70643537. The next prime is 70643543. The reversal of 70643540 is 4534607.

It is an interprime number because it is at equal distance from previous prime (70643537) and next prime (70643543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70643543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22040 + ... + 25040.

It is an arithmetic number, because the mean of its divisors is an integer number (3404268).

Almost surely, 2^70643540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70643540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81702432).

70643540 is an abundant number, since it is smaller than the sum of its proper divisors (92761324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70643540 is a wasteful number, since it uses less digits than its factorization.

70643540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128 (or 3126 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 70643540 is about 8404.9711480766. The cubic root of 70643540 is about 413.3876373906.

The spelling of 70643540 in words is "seventy million, six hundred forty-three thousand, five hundred forty".